Federal investigators had “looked at” Sikh temple gunman Wade Michael Page more than once because of his associations with right-wing extremists and the possibility that he was providing funding to a domestic terrorist group, but law enforcement officials at the time determined there was not enough evidence of a crime to open an investigation, a senior U.S. law enforcement official said.

Before his rampage Sunday at a Sikh temple in Oak Creek, Wis., that left him and six others dead and three critically wounded, Page was known to civil rights groups as a member of two racist skinhead bands – End Apathy and Definite Hate. He was also believed to have been a low-level member of a national white supremacist group called the Hammerskins.